Hoist mechanism for dumping vehicles



Dec. 28, 1954 B. GODBER HGIST MECHANISM FOR DUMPING VEHICLES 2Sheets-Sheet 1 Filed Dec. 14, 1953 flnvcm'or ran 1.. Godbersen /MM f 4%cql'torngga Dec. 28, 1954 B. GODBERSEN HOIST MECHANISM FOR DUMPINGVEHICLES 2 Sheets-Sheet 2 Filed Dec. 14, 1953 United States Patent HOISTMECHANISM FOR DUMIPING VEHICLES Byron L. Godbersen, Mapleton, IowaApplication December 14, 1953, Serial No. 398,007

Claims. (Cl. 298-22) My invention relates to improvements in hoists andis more particularly adapted for use with wagon bodies.

The application of a hoist or jack to one end of a wagon or truck bodyto facilitate unloading the contents thereof is, of course, a commonpractice and with particular reference to wagon bodies which are notselfpropelled such hoists or jacks are generally a separate piece ofapparatus used as the occasion demands. Consequently such hoists must becarried as additional equipment, and, of course, must be mounted for useon each occasion.

With these observations in mind it is the general aim of my invention toprovide a hoist means for a wagon body that is mounted as a regularcomponent of the body structure.

Another object of this invention is to provide a hoist of the aboveclass that is foldable and retractable into a compact form when not inuse so as to offer no interference with the normal use of the Wagonbody.

Still another object of my invention is to provide a wagon mounted hoistwhich is always in position for use in dumping or spilling loads andwhich is hydraulically operated with means for attachment to a source ofhydraulic power on a tractor, truck or the like. In this respect thishoist is a big timesaver as the hydraulic connection is all that need bedone before the hoist is ready to use.

These and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement, and combinationof the various parts of the device, whereby the objects contemplated areattained as hereinafter more fully set forth, specifically pointed outin my claims, and illustrated in the accompanying drawings, in which:

Fig. l is a perspective view of a wagon body in elevated position andillustrating a preferred embodiment of my inventon,

Fig. 2 is an enlarged side elevational view of this hoist innon-operable position with fragmentary portions of a wagon body shown insection,

1 Fig. 3 is a cross sectional view taken on the line 3-3 of Fig. 2,

Fig. 4 is a top plan view of this hoist taken from the line 4-4 of Fig.2,

Fig. 5 is a reduced side elevational view partly in section showing thehoist in a partially elevated position in solid lines and in fullelevated position in broken lines, and

Fig. 6 is a side view showing my hoist in elevated position andillustrating a modified connecting means between the hydraulic pistonand lifting arm.

Referring to the drawings a wagon box of ordinary construction is shownat 10 mounted on a wheeled chassis 12. The forward portion of thechassis carries a bolster 14 mounted transversely of the wheels and alike bolster 16 is similarly disposed at the rear of the chassis. Eachend of each bolster is provided with a vertically disposed stop orabutment 18 and between these stops and on the respective bolsters willrest portions of sides 20 and 22 of a frame mounted to the underside ofwagon body 10 as illustrated in Fig. 1. 'Abutments 18 hold the body 10against lateral movement with my hoist shown generally at 24, serving tolimit forward movement as will later appear, and for the purpose oflimiting a rearward movement of body 10 on the bolster 2,698,199Patented ,Dec. 28, 1954 16 particularly when the wagon is tilted fordumping, I have provided on the rear portion of the respective sides 20and 22 a depending bar 26 that engages the for ward side of bolster 16.By this means sides 20 and 22 in effect can rock on bolster 16 withoutsliding or slipping as shown in Fig. 1.

Referring now to my new hoist 24 I have provided a rectangular framemember 28 pivotally mounted at one end to bolster 14 so that its majoraxis is parallel to the major axis of chassis 12 and extends rearwardlyfrom bolster 14. A stub shaft 30 projects from each side of the forwardend of frame 28 (Fig. 3) and is pivotally journaled in a bearing member32 which contains a clamp means 34 for attachment to bolster 14. Ahydraulic piston assembly 36 is mounted to frame 28 for pivotal movementtherewith so that the plunger rod portion 38 extends and retracts fromthe rearward side thereof and has the hose 39 for connection to a sourceof hydraulic power (not shown) in a manner well known in the art. A pairof like elongated lifting arms 40 and 42 are triangular in shape and areoppositely disposed at the rearward inner sides of frame 28 where theyare pivotally attached to such frame by a pin 44 that connects with eacharm 40 and 42 at one side of their wider or bottom end as shown in Fig.5. A pipe, rod or bar 45 is secured to and between the arms 40 and 42 attheir wider ends for reinforcing purposes. The top or narrow end of arms40 and 42 are each pivotally connected between the respective pairs ofcars 46 and 48 (Fig. 3) which depend from the center portion of aninverted U bracket 50 that is mounted to the frame sides 20 and 22 onthe forward portion of the underside of wagon body 10 as shown at 52 and54 in Fig. 3. A U-shaped member or yoke consisting of the relativelyshort parallel arms or links 56 and 58 hinged at oppositely disposedends to a cross member 60 is mounted with the respective free ends ofarms or links 56 and 58 oppositely disposed relative to the plunger endof hydraulic assembly 36 where they are pivotally secured respectivelyto lifting arms 40 and 42 by means of a pin 62 at a point spaced frompins 44 toward the narrow end of the lifting arms. Thus as seen in Figs.2 and 4, the pivotal connection of the lifting arms at pin 44 to frame28 is at one side near the bottom of the lifting arms and the pivotalconnection of the yoke arms 56 and 58 to the lifting arms at pin 62 isat a point on the lifting arms approximately opposite to the free end ofthe housing of the hydraulic assembly. The cross member 60 of the yokecarries a socket 64 into which the free end of the plunger rod 38extends.

With reference now to Figs. 2 and 4 a stop member 66 is formed on thebottom or wider end of each lifting arm 40 and 42 and on the inner sidethereof. On the outer side of each wide end of arms 40 and 42 is weldeda stop block or bar 68 and at each side of the rear end of frame 28 issecured an abutment plate 70.

Thus constructed and arranged, this hoist means will operate in thefollowing manner. Fig. 3 illustrates the non-operating or retractedposition of my hoist means with the wagon box level for purposes oftransportation. To raise box 10 to position shown in Fig. 1, hose 39 isfirst connected to a source of hydraulic power and the hoist is readyfor use since it is a regular part of the wagon construction andrequires no setting or adjustment. As hydraulic pressure is applied,plunger rod 38 pushes against socket 64 which is a part of the crossmember 60. Cross member 60 in turn in non-open able position abutsagainst stops 66 on the lifting arms 40 and 42 with the result that thelifting arms 40 and 42 begin to move upwardly on pin 44. As this occursstop block 66 moves out of alignment with cross member 60 and frame 28together with the hydraulic assembly 36 swing upwardly and forwardly inan are on the pivot point on bolster 14 with the arms 56 and 58 of theyoke pivoting on the pins 62 to keep the hydraulic assembly 36 in properalignment with frame 28. Thereafter the continued force of the plungerrod 38 against the yoke transmits force through arms 56 and 58 tocontinue the rise of the lifting arms to a height determined by thepoint at which block 68 engages the abutment plate 70 (Fig. 1) and stopsthe upward movement of the lifting arms before they move past center onpin 44 for obvious reasons in assuring the return movement of the hoistby the release of the hydraulic pressure.

The action of my new lifting arms makes possible the use of a relativelysmall hydraulic assembly compared to those-in separate hydraulic jacksused for the same purpose. The arms 40 and 42 provide lifting means to aheight normally requiring a much longer plunger rod than here employedand at the same time because of the novel pivotal connections will foldor retract into a compact unit (Fig. 2) so that it can be easily adaptedfor mounting as a regular part of the wagon 10.

In Fig. 6 where like parts carry like numerals I have shown a slightmodification by using a cable 72 in place of theyoke arm's56 and 58. Forthis purpose the reinforcing bar 45 shown in Fig. 4 has the centerportion removed to leave on the inner side of each lifting arm 40 and 42the boss member 74 and pin 44 is rigidly secured to arms 40 and 42 forreinforcing the same. The free outer edge of cross beam 60 is providedwith a groove 76 co-exten'siv'e' in length therewith and cable 72 islaid in this groove with its respective ends being affixed to arms 40and 42 near pin 44. By this arrangement cable 72 frictionally rides overboss members 74 with the resulting rise of arms 49 and 44 as abovedescribed.

Some changes may be made in the construction and arrangement of my hoistwithout departing from the real spirit and purpose of my invention, andit is my intention to cover by my claims, any modified forms ofstructure or use of mechanical equivalents which may be reasonablyincluded within their scope.

I claim:

1. In combination, a wheeled chassis, a wagon body pivoted at its rearend portion to the rear end portion of said wheeled chassis and movablebetween a lowered and a raised position, a frame hinged at its forwardend to the front end portion of said wheeled chassis, a lever memberhaving its forward end hinged to the under area of said wagon body andits rear end pivoted to the rear end of said frame, a hydraulic jackassembly including a cylinder portion operatively hinged to the forwardend portion of said wheeled chassis and a piston member having a freeend extending rearwardly toward the rear end portion of said levermember, a link member operatively hinged at one end to the free end ofsaid piston member and hinged at its other end to said lever member, andan abutment member on said lever member disposed initially in operativeengagement with the free end of said piston member when said levermember and frame are in a collapsed condition and said wagon body is inthe lowered position, the free end of said piston member being freedfrom operative engagement with said abutment member after said levermember and frame expand a predetermined amount and said wagon body hasbegun to rise.

2. In combination, a wheeled chassis, a wagon body pivoted at its rearend portion to the rear end portion of said wheeled chassis and movablebetween a lowered and raised position, a frame hinged at its forward endto the front end portion of said wheeled chassis, a lever member havingits forward end hinged to the under area of said wagon body and its rearend pivoted to the rear end of said frame, a hydraulic jack assemblyincluding a cylinder portion operatively hinged to the forward endportion of said wheeled chassis and a piston member having a free endextending toward the rear end portion of said lever member, meanspivotally interconnecting the free end of said piston member to saidlever member at pivot points having spaced parallel axes, and anabutment means on said lever member disposed initially in substantiallongitudinal alignment and operative engagement with the free end ofsaid piston member when said lever member and said frame are in acollapsed condition and said wagon body is in the lowered position, thefree end of said piston member being freed from operative engagementwith said abutment means when said lever member is pivoted apredetermined amount on said frame member whereby a continued force ofsaid piston member is transferred to said lever member through saidmeans pivotally interconnecting the free end of said piston member tosaid lever member.

3. A device of the character described in claim 2 wherein said meanspivotally interconnecting the free end of said piston member to saidlever member is a rigid link member.

4. -A device of the character described in claim 2 wherein said meanspivotally interconnecting the free end of said piston member to saidlever member is a cable.

5. A hoist adapted to raise and lower a wagon body hinged at its rearend to a wheeled chassis comprising a frame adapted to be hinged at oneof its ends to the forward end of said wheeled chassis, a lever memberhaving one of its ends pivotally connected to the end of said frameopposite the end which is adapted to be hinged to the wheeled chassisand the other of its ends adapted to be pivotally connected to the underarea of the wagon body, a hydraulic jack assembly including a cylinderportion hinged to said frame at a point adjacent the end of said framewhich is adapted to be hinged to said wheeled chassis and a pistonmember having a free end extending toward the connected ends of saidlever member and frame, means pivotally interconnecting the free end ofsaid piston member to said lever member at pivot points having spacedparallel axes, abutment means on said lever member disposed initially insubstantial longitudinal alignment and operative engagement with thefree end of said piston member when said lever member and said frame arefolded into a substantially parallel collapsed position, the free end ofsaid piston member being freed from operative engagement with saidabutment means when said lever member has pivoted on said frame apredetermined amount whereby a continued force of said piston member istransferred to said lever member through said means pivotallyinterconnecting the free end of said piston to said lever member.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 2,226,213 Wood Dec. 24, 1940 2,332,961 Wood z; Oct. 26, 19432,620,225 Hutchinson Dec. 2, 1952 2,635,004 Shadwek Apr. 14, 19532,667,381 Tripodi t Jan. 26, 1954 FOREIGN PATENTS Number Country Date 7172,175 Great Britain Dec. 8, 1921

